Positive Neural Networks in Discrete Time Implement Monotone-Regular Behaviors

21 Feb 2015  ·  Tom J. Ameloot, Jan Van den Bussche ·

We study the expressive power of positive neural networks. The model uses positive connection weights and multiple input neurons... Different behaviors can be expressed by varying the connection weights. We show that in discrete time, and in absence of noise, the class of positive neural networks captures the so-called monotone-regular behaviors, that are based on regular languages. A finer picture emerges if one takes into account the delay by which a monotone-regular behavior is implemented. Each monotone-regular behavior can be implemented by a positive neural network with a delay of one time unit. Some monotone-regular behaviors can be implemented with zero delay. And, interestingly, some simple monotone-regular behaviors can not be implemented with zero delay. read more

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